/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.io.gcp.pubsub;



import com.bff.gaia.unified.sdk.coders.*;

import com.bff.gaia.unified.sdk.coders.ByteArrayCoder;

import com.bff.gaia.unified.sdk.coders.Coder;

import com.bff.gaia.unified.sdk.coders.CustomCoder;

import com.bff.gaia.unified.sdk.coders.MapCoder;

import com.bff.gaia.unified.sdk.coders.NullableCoder;

import com.bff.gaia.unified.sdk.coders.StringUtf8Coder;

import com.bff.gaia.unified.sdk.values.TypeDescriptor;



import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.util.Map;



/** A coder for PubsubMessage including attributes. */

public class PubsubMessageWithAttributesCoder extends CustomCoder<PubsubMessage> {

  // A message's payload can not be null

  private static final Coder<byte[]> PAYLOAD_CODER = ByteArrayCoder.of();

  // A message's attributes can be null.

  private static final Coder<Map<String, String>> ATTRIBUTES_CODER =

      NullableCoder.of(MapCoder.of(StringUtf8Coder.of(), StringUtf8Coder.of()));



  public static Coder<PubsubMessage> of(TypeDescriptor<PubsubMessage> ignored) {

    return of();

  }



  public static PubsubMessageWithAttributesCoder of() {

    return new PubsubMessageWithAttributesCoder();

  }



  @Override

  public void encode(PubsubMessage value, OutputStream outStream) throws IOException {

    encode(value, outStream, Context.NESTED);

  }



  public void encode(PubsubMessage value, OutputStream outStream, Context context)

      throws IOException {

    PAYLOAD_CODER.encode(value.getPayload(), outStream);

    ATTRIBUTES_CODER.encode(value.getAttributeMap(), outStream, context);

  }



  @Override

  public PubsubMessage decode(InputStream inStream) throws IOException {

    return decode(inStream, Context.NESTED);

  }



  @Override

  public PubsubMessage decode(InputStream inStream, Context context) throws IOException {

    byte[] payload = PAYLOAD_CODER.decode(inStream);

    Map<String, String> attributes = ATTRIBUTES_CODER.decode(inStream, context);

    return new PubsubMessage(payload, attributes);

  }

}